Remove Unixware and openserver support

cde/programs/dtdocbook/sgmls/Imakefile

@@ -40,14 +40,6 @@ HDRS=action.h adl.h entity.h error.h etype.h sgmldecl.h keyword.h lextoke.h \
 
 PROGRAMS = $(PROG1) $(PROG2) $(PROG3)
 
-#ifdef USLArchitecture
-/* work around likely optimizer problem */
-context.o: context.c
-	RemoveFile($@)
-	ClearmakeOSName
-	$(CC) -c $(CCOPTIONS) $(THREADS_CFLAGS) $(ALLDEFINES) $*.c
-#endif
-
 ComplexProgramTarget_1(sgmls,,)
 ComplexProgramTarget_2(sgmlsasp,,)
 ComplexProgramTarget_3(rast,,)